EXPENSES, CHANGE IN FAIR VALUE OF INVESTMENTS AND OTHER - Schedule of General and Administrative Expenses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Other Income and Expenses [Abstract]
Legal and professional	$ 20,822	$ 18,587	$ 49,408	$ 36,806
Loan origination	35,015	44,916	74,916	85,161
Occupancy	28,886	10,221	58,663	20,571
Subservicing	41,987	45,278	88,795	95,117
Loan servicing	4,866	4,627	10,170	9,306
Property and maintenance	22,108	15,755	45,711	27,885
Other	71,587	33,602	143,846	62,001
Total general and administrative expenses	$ 225,271	$ 172,986	$ 471,509	$ 336,847